In order to replace a trailer hub, you will need to know the bolt pattern. The majority of trailers have a 4, 5, or 6 bolt pattern.

The bolt pattern is a numbered description based on the amount of wheel studs in comparison to the distance between them. The distance is measured from any wheel stud to the area directly opposite the hub face. This measurement can also be discerned by measuring the stud spacing. See below illustration.

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